Seismic Fortification Intensity Evaluation by a Cost-Benefits Analysis_ Case Study of Three Bridges

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Xiaxin, Tao^1,2 ; Zhengru, Tao^2 ; Dong, Li^1

School of Civil Engineering, Harbin Institute of Technology, Harbin

150090, China^1

Institute of Engineering Mechanics, CEA, Harbin

150080, China^2

关键词: Construction costs;    Cost-benefits analysis;    Damage index;    Fortification intensities;    Push overs;    Seismic fortification intensity;    Seismic risk;    Stiffness degradation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/5/052043/pdf
DOI  :  10.1088/1755-1315/189/5/052043

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

A case study on evaluation of seismic fortification intensity by cost-benefit analysis is presented in this paper. Three bridges designed with intensities VI, VII and VIII are modeled and their seismic responses are calculated by push-over approach, and the damage indices are estimated by a stiffness degradation model. The vulnerability matrices are built from a set of probability density functions and the damage results. In seismic risk cost assessments of the bridges, both direct and indirect losses are taken into account by ratios to the original construction costs. The fortification intensity is evaluated from the minimum sum of the original cost and seismic risk cost in bridge life -cycle. The result shows that the most effective intensities at three sites with different hazards are close to those with exceeding probability 10 % in 50 years, except that intensity VIII is little bit better at a site in intensity VII zone.